Screw-threading device



(No Model.) 2 Sheets-Sheet 1 R. 'HILDWEIN.

SCREW THREADING DEVI-GB.

No. 2a9,415. Patented Dec. 4, 1883.

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R. HILDWEINQ SCREW THEBADING DEVICE.

V N0.'Z8'9,415. v Batentd'Dec.4,1883.

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UNITED STATES PATENT trier.

ROBERT HILDWEIN, or CLEVELAND, onio.

SCREW-THREADING DEVICE.

SPECIFICATION formingpart of Letters Patent No.289,415, dated December 4, 1883.

Application filed June 25, 1883. (No model.)

To all whom it may concern:

Be it known that I,RBEBT HILDWEIN, of Cleveland, in the county of Guyahoga and State of Ohio, have inventeda certain new and Improved Screw-Threading Device; andI do hereby declare that the following is a full, clear, and complete description thereof.

The improvement in screw-threadin g devices above alluded to consists of a device for locking the dies thereof when they have been set for cutting athread on the bolt, the purpose of the lock being toprevent the dies from moving back while actively engaged in cutting thethread. I g l I 5 A detailed description of the lock and the practical working of the same are as follows, reference being had to the accompanying drawings, making a part of this specification, in which- Figure 1 represents an upper side view of the screw-threading device. Fig. 2 is a view of the front end of the screw-threading device. Fig. 3 is a side view, partially in section. Figs. 4 and 5 are detached sections.

Like letters of reference refer to like parts in the several views.

The body of the screw-threading device consists of a cylinder, A, having in each of its four corresponding opposite sides a rectangu- 0 lar mortise, in which are closely fitted, respectively, the screw cutters or dies (1, b, c, and (1, arranged to move radially in relation to the axial line of the cylinder for being concentrated upon the bolt for cutting a thread 3 5 thereon.

The reciprocal radial movement of the dies is effected as follows: The outer end of each of the dies is an inclined plane, as seen at c in Fig. 4. Along one side of the inclined plane is a flange,

40 f, corresponding therewith, as seen in said Fig. 4. To the die-cylinder Aabove referred to is fitted movably thereon a sleeve, B, on the front end of which is a rigid collar, 0, having therein four inclined grooves, arranged in relation to and adapted to fit the inclined planes and flanges of the thread cutters or dies at, b, 0, and d, as seen in Figs. 2 and 4. On the opposite end of the sleeve is a free collar, D, provided with a peripheral groove, E, Said collar is moved back and forth on the sleeve B for moving the sleeve on the cylinder in one direction to close the dies, and in the opposite direction to open them, bya bifurcated lever, F. The branch G of said lever is pivoted at H to a standard, I, and by means of a pin, m, is in connection 5 5 with the collar D, (the pin being free to move .in the groove E of the collar.) The opposite branch, J, of the lever is also connected to the collar 1) by a pin, c. To the sleeveB is fixed a stay, K, in which is pivoted a wheel, L, trans- 6o versely in the edge of which is a notch, 0, adapted to receive a pin, M, fixed in a sliding plate, (which may be adjusted by a set-screw,

B, for setting the dies to different-size bolts by screwing said set-screw inward or outward, as the case may be,) and projecting therefrom through slot h in the sleeve into the notch of the wheel, as shown in Figs. 1 and 5. Also, in the edge of the wheel L is a radial hole, 1', indicated by the dotted lines in Fig. 1, and in 7Q such relation to the notch a in the wheel as shown in said Fig. 1. The hole 13 is adapted to receive the pin N, secured in and projecting from the movable collar D, as shown in said Fig. 3. Also, in said collar D is apin or 7 stud, b, which projects therefrom into a slot, 0, made in the sleeve B, and by which the sleeve is actuated, as will presently be shown. Practically the operation of the locking device above described is as follows: As shown in the drawings, the dies are represented as partly closed, which is done by pushing the lever F in the direction of the arrow, and from the dotted line w, its previous position. This movement of the lever carries the collar D with it in the same direction, thereby causing the pin N to impinge upon the blank edge of the wheelL, which will push the sleeve B to the position shown in the drawings, at the same time partly closing in the dies, as above said, by the action of the inclined planes of the grooves in the collar 0 of the sleeve upon the inclined planes of the dies. During the abovenamed movement of thesleevethe wheel L will be so far turned by the notch a engag- 5 ing the pin or stud M as to bringthe holei in the wheel near to the pin N. Now, on pushin g the lever still farther in the direction of the arrow the sleeve will be carried forward to the line A, the end of the inclined planes of the dies thereby fully closing them for cutting the thread on a given size bolt. Vhile the sleeve is moving to the line A the stud M will turn the wheel L so far as to bring the hole 1' of the wheel in alignment with the pin N, which enters therein and holds the wheel from turning, thereby locking the dies, as set for a given size bolt, by preventing the inclined planes of the grooves in the sleeve from moving down the inclined planes of the dies, in consequence of the expansive force exerted upon them while cutting thethread on' the bolt. The thread having been cut on the bolt, the dies are then opened by pushing the lever in the opposite direction of the arrow. This reversed movement of the lever first draws the pin N from the hole 6 of the wheel without (at the same time) moving back the sleeve. This results from the stud b, which, as above said, projects from the collar D into a slot, 0', made in the sleeve. This slot allows the stud to be drawn back therein far enough for the pin N to be-pulled from the hole 1; before the stud engages the end of the slot, by which (and the said stud) the sleeve is drawn back, which it does immediately after the pin leaves the hole as the lever continues to be pushed back to the line 00. As the sleeve moves back the dies are opened by the flanges of the dies, which move upon corresponding inclined shoulders of the grooves in which the dies are fitted, as seen in Fig. 2.

From the above it will be obvious that the dies, when set for cutting a thread on the bolt,

are-held firmly in place for that purpose, thereby producing a uniformity in the threaded part of the bolt.

\Vhat I claim as my invention, and desire to secure by Letters Patent, is-

1. The combination, with the die-cylinder, sleeve 13, and dies, the wheel L, provided with a notch and pin-hole in the periphery thereof, stud M, fixed in a sliding adjustable plate, and projecting therefrom through said sleeve in a slot, to allow a reciprocal move ment of the sleeve in its relation to the stud, pin N, and movable collar, substantially as described, and for the purpose set forth.

2. In combination with the wheel L and sleeve, the pin, movable collar, and the stud b, projecting from the collar into a slot out in the said sleeve to allow a reciprocal movement of the stud in the sleeve for operating the same, and the pin N, substantially as described, and for the purpose set forth.

3. In a screw-threading device, in combination with the die-cylinder, the sleeve, and dies, the wheel L, having in its periphery a notch .and pin-hole, the stud M and pin,.the movable collar, stud b, and the lever F, constructed and arranged to operate in the manner substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

ROBERT HILDWVEIN. WVitnesses:

J. H. BURRIDGE, S. ANDEsoN. 

